package models

import (
	"errors"
	"fmt"
	"github.com/astaxie/beego"
	"github.com/astaxie/beego/orm"
	"reflect"
	"strings"
	"time"
)

type Flow struct {
	Id            string          `orm:"column(id);pk"`
	Name          string          `orm:"column(name);null"`
	Busyname      string          `orm:"column(busyname);null"`
	Level         int             `orm:"column(level);null"`
	Remark        string          `orm:"column(remark);null"`
	Start         string          `orm:"column(start);null"`
	End           string          `orm:"column(end);null"`
	Status        int             `orm:"column(status)"`
	Isdelete      int             `orm:"column(isdelete)"`
	Ctime         time.Time       `orm:"column(ctime);type(timestamp with time zone)"`
	Creater       string          `orm:"column(creater)"`
	Utime         time.Time       `orm:"column(utime);type(timestamp with time zone)"`
	Updater       string          `orm:"column(updater)"`
	States        []*State        `orm:"reverse(many)"`
	Transitions   []*Transition   `orm:"reverse(many)"`
	Flowinstances []*Flowinstance `orm:"reverse(many)"`
}

func (t *Flow) TableName() string {
	return "fsm_flow"
}

func init() {
	orm.RegisterModel(new(Flow))
}

// AddFlow insert a new Flow into database and returns
// last inserted Id on success.
func AddFlow(m *Flow) (id int64, err error) {
	o := orm.NewOrm()
	id, err = o.Insert(m)
	return
}

// GetFlowById retrieves Flow by Id. Returns error if
// Id doesn't exist
func GetFlowById(id string) (v *Flow, err error) {
	o := orm.NewOrm()
	v = &Flow{Id: id}
	if err = o.Read(v); err == nil {
		o.LoadRelated(v, "States")
		o.LoadRelated(v, "Transitions")
		return v, nil
	}
	return nil, err
}

// GetAllFlow retrieves all Flow matches certain condition. Returns empty list if
// no records exist
func GetAllFlow(query map[string]string, fields []string, sortby []string, order []string,
	offset int64, limit int64) (ml []interface{}, err error) {
	o := orm.NewOrm()
	qs := o.QueryTable(new(Flow))
	// query k=v
	for k, v := range query {
		// rewrite dot-notation to Object__Attribute
		k = strings.Replace(k, ".", "__", -1)
		if strings.Contains(k, "isnull") {
			qs = qs.Filter(k, (v == "true" || v == "1"))
		} else {
			qs = qs.Filter(k, v)
		}
	}
	// order by:
	var sortFields []string
	if len(sortby) != 0 {
		if len(sortby) == len(order) {
			// 1) for each sort field, there is an associated order
			for i, v := range sortby {
				orderby := ""
				if order[i] == "desc" {
					orderby = "-" + v
				} else if order[i] == "asc" {
					orderby = v
				} else {
					return nil, errors.New("Error: Invalid order. Must be either [asc|desc]")
				}
				sortFields = append(sortFields, orderby)
			}
			qs = qs.OrderBy(sortFields...)
		} else if len(sortby) != len(order) && len(order) == 1 {
			// 2) there is exactly one order, all the sorted fields will be sorted by this order
			for _, v := range sortby {
				orderby := ""
				if order[0] == "desc" {
					orderby = "-" + v
				} else if order[0] == "asc" {
					orderby = v
				} else {
					return nil, errors.New("Error: Invalid order. Must be either [asc|desc]")
				}
				sortFields = append(sortFields, orderby)
			}
		} else if len(sortby) != len(order) && len(order) != 1 {
			return nil, errors.New("Error: 'sortby', 'order' sizes mismatch or 'order' size is not 1")
		}
	} else {
		if len(order) != 0 {
			return nil, errors.New("Error: unused 'order' fields")
		}
	}

	var l []Flow
	qs = qs.OrderBy(sortFields...)
	if _, err = qs.Limit(limit, offset).All(&l, fields...); err == nil {
		if len(fields) == 0 {
			for _, v := range l {
				ml = append(ml, v)
			}
		} else {
			// trim unused fields
			for _, v := range l {
				m := make(map[string]interface{})
				val := reflect.ValueOf(v)
				for _, fname := range fields {
					m[fname] = val.FieldByName(fname).Interface()
				}
				ml = append(ml, m)
			}
		}
		return ml, nil
	}
	return nil, err
}

// UpdateFlow updates Flow by Id and returns error if
// the record to be updated doesn't exist
func UpdateFlowById(m *Flow) (err error) {
	o := orm.NewOrm()
	v := Flow{Id: m.Id}
	// ascertain id exists in the database
	if err = o.Read(&v); err == nil {
		var num int64
		if num, err = o.Update(m); err == nil {
			fmt.Println("Number of records updated in database:", num)
		}
	}
	return
}

// DeleteFlow deletes Flow by Id and returns error if
// the record to be deleted doesn't exist
func DeleteFlow(id string) (err error) {
	o := orm.NewOrm()
	v := Flow{Id: id}
	// ascertain id exists in the database
	if err = o.Read(&v); err == nil {
		var num int64
		if num, err = o.Delete(&Flow{Id: id}); err == nil {
			fmt.Println("Number of records deleted in database:", num)
		}
	}
	return
}

// GetFlowBybusy 根据业务名称和流程级别获取流程
func GetFlowBybusy(bname string, level int) (v *Flow, err error) {
	o := orm.NewOrm()
	qs := o.QueryTable(new(Flow))
	qs = qs.Filter("Busyname", bname).Filter("Level", level).Filter("Status", 1).Filter("IsDelete", 0)
	err = qs.One(&v)
	if err != nil {
		return nil, err
	}
	return v, nil
}

// GetFlowByName 根据流程名称获取流程
func GetFlowByName(name string) (v *Flow, err error) {
	o := orm.NewOrm()
	var flow Flow
	qs := o.QueryTable(new(Flow))
	qs = qs.Filter("Name", name).Filter("Status", 1).Filter("IsDelete", 0)
	err = qs.One(&flow)
	if err != nil {
		beego.Error(err)
		return nil, err
	}
	return &flow, nil
}

// CreateFlow 创建流程
func CreateFlow(flow *Flow, states []*State, transitions []*Transition) (err error) {
	o := orm.NewOrm()
	err = o.Begin() // 事务处理过程
	_, err = o.Insert(flow)
	if err != nil {
		beego.Error(err)
		err = o.Rollback()
		return
	}
	for _, v := range states {
		_, err = o.Insert(v)
		if err != nil {
			beego.Error(err)
			err = o.Rollback()
			return
		}
	}
	for _, v := range transitions {
		_, err = o.Insert(v)
		if err != nil {
			beego.Error(err)
			err = o.Rollback()
			return
		}
	}
	err = o.Commit()
	return
}

// SoftDeleteFlow 软删除流程
func SoftDeleteFlow(id string, uname string) (err error) {
	o := orm.NewOrm()
	query := map[string]interface{}{
		"id": id,
	}
	_, err = SoftDelete(o, "fsm_flow", query, uname)
	//	用户
	// // ascertain id exists in the database
	// if err = o.Read(&v); err == nil {
	// 	var num int64
	// 	if num, err = o.Delete(&Flow{Id: id}); err == nil {
	// 		fmt.Println("Number of records deleted in database:", num)
	// 	}
	// }
	return
}

// UpdateFlow 更新流程
func UpdateFlow(flow *Flow, states []*State, transitions []*Transition) (err error) {
	o := orm.NewOrm()
	err = o.Begin() // 事务处理过程
	_, err = o.Insert(flow)
	if err != nil {
		beego.Error(err)
		err = o.Rollback()
		return
	}
	for _, v := range states {
		_, err = o.Insert(v)
		if err != nil {
			beego.Error(err)
			err = o.Rollback()
			return
		}
	}
	for _, v := range transitions {
		_, err = o.Insert(v)
		if err != nil {
			beego.Error(err)
			err = o.Rollback()
			return
		}
	}
	err = o.Commit()
	return
}
